OXYGEN Level [20% of Air] will become 1third lesser [<14% of Air] since this world will be burning with fire and no green grass.
Revelation:8:7: "The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up."
Revelation:9:4: "And it was commanded them that they should not hurt the grass of the earth, neither any green thing, neither any tree; but only those men which have not the seal of God in their foreheads."
Isaiah:15:6: "For the waters of Nimrim shall be desolate: for the hay is withered away, the grass faileth, there is no green thing."
Luke:23:31: "For if they do these things in a green tree, what shall be done in the dry?"
Exodus:10:15: "For they covered the face of the whole earth, so that the land was darkened; and they did eat every herb of the land, and all the fruit of the trees which the hail had left: and there remained not any green thing in the trees, or in the herbs of the field, through all the land of Egypt."
Ezekiel:17:24: "And all the trees of the field shall know that I the LORD have brought down the high tree, have exalted the low tree, have dried up the green tree, and have made the dry tree to flourish: I the LORD have spoken and have done it."
Ezekiel:20:47: "And say to the forest of the south, Hear the word of the LORD; Thus saith the Lord GOD; Behold, I will kindle a fire in thee, and it shall devour every green tree in thee, and every dry tree: the flaming flame shall not be quenched, and all faces from the south to the north shall be burned therein."
Matthew:6:30: "Wherefore, if God so clothe the grass of the field, which to day is, and to morrow is cast into the oven, shall he not much more clothe you, O ye of little faith?"
Luke:12:28: "If then God so clothe the grass, which is to day in the field, and to morrow is cast into the oven; how much more will he clothe you, O ye of little faith?"
James:1:10,11: "But the rich, in that he is made low: because as the flower of the grass he shall pass away. For the sun is no sooner risen with a burning heat, but it withereth the grass, and the flower thereof falleth, and the grace of the fashion of it perisheth: so also shall the rich man fade away in his ways."
1Peter:1:24: "For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away:"
Isaiah:40:7,8: "The grass withereth, the flower fadeth: because the spirit of the LORD bloweth upon it: surely the people is grass. The grass withereth, the flower fadeth: but the word of our God shall stand for ever."